Modular Chiseling Tool Head Coupling for Wear and Heat Control
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Solution Overview
Problem
Existing rock chiseling tools experience premature failure due to energy loss and welding at the interface between the tool head and shank, leading to reduced wear performance and high operating costs.
Innovation Solution
A modular tool design with a displaceable tool head on the shaft allows efficient energy transfer and minimizes heating, featuring a suction channel for dust extraction and a rotationally fixed connection with a polygonal cross-section, along with a locking mechanism and spring element for easy detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tool head is rigidly fixed to the shaft, then the structural stability is improved, but the impact energy transmission efficiency deteriorates due to energy loss at the interface
Solution Approach 1:
The tool head is designed to be displaceable along the longitudinal axis of the shaft, transforming a static rigid connection into a dynamic movable connection. This allows the tool head to move relative to the shaft during operation, enabling efficient impact energy transmission while maintaining structural stability through the movable coupling mechanism
2Loss of energy
If the tool head is displaceably mounted on the shaft, then the impact energy transmission efficiency is improved, but the risk of welding due to heat generation worsens
Solution Approach 1:
A suction channel is introduced into the shaft to create a flow of air or gas that passes through the interface between the tool head and shaft. This pneumatic flow serves dual purposes: extracting rock dust generated during operation and providing cooling to the boundary area to prevent welding, thereby resolving the heat-related harmful effects while maintaining efficient energy transmission
3Ease of repair
If the tool is designed modularly with replaceable tool head, then the operating costs are reduced, but the coupling mechanism complexity increases
Solution Approach 1:
The tool is divided into modular components with the tool head being a separate replaceable element from the shaft. This segmentation allows the tool head to be easily detached and replaced when worn, reducing operating costs. The coupling mechanism achieves this modularity through a relatively simple movable connection with locking elements, avoiding excessive complexity while enabling easy maintenance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves high mining performance with a long service life by preventing welding and reducing energy loss, while the suction channel enhances cooling and dust removal.
Implementation Method 1
Using a tool with a suction channel, rock dust generated during operation can be extracted. Furthermore, air flowing through the suction channel can provide additional cooling to the interface
Implementation Method 2
air flowing through the suction channel can provide additional cooling to the interface
Implementation Method 3
the shaft can have a polygonal, in particular hexagonal, cross-section, at least in the boundary area to the tool head and/or at a corresponding boundary area to the insertion end
Data Source
Figure 1~4
Figure 5~10
Figure 11~13
AI summary
The invention relates to a tool (10) for the chiseling extraction of rock, in particular a hammer drill or chisel, comprising at least one shaft (12) to which a tool head (14) is coupled at one end and to which an insertion end (16) is formed at the other end. The tool head (14) is coupled to the shaft (12) and the tool head (14) is displaceably mounted on the shaft (12) along a longitudinal axis (L) of the shaft (12). The invention further relates to a tool head (14) and a shaft (12). The tool (10) can have a long service life despite a modular design.